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Scientists confirmed on Thursday that they have discovered oil on dead dolphins found along the U.S. Gulf Coast, raising fresh concerns about the effects of last year’s BP oil spill on sea life.

Fifteen of the 406 dolphins that have washed ashore in the last 14 months had oil on their bodies, National Oceanic and Atmospheric Administration scientists said during a conference call with reporters.

The oil found on eight of those dolphins has been linked to the April 2010 BP oil spill in the Gulf of Mexico, scientists said.

“It is significant that even a year after the oil spill we are finding oil on the dolphins, the latest just two weeks ago,” said Blair Mase, southeast marine mammal stranding coordinator for NOAA Fisheries.

Since mid-March, 87 dead sea turtles have also been found, although no visible traces of oil have been discovered on the carcasses, said Barbara Schroeder, NOAA Fisheries national sea turtle coordinator.